Public warned about potentially toxic algae

Media Release 16 January
2013Public warned about potentially toxic
algaeLaboratory results have been unable to confirm
whether a dog which died after a walk along the Tukituki
River bank was affected by toxic algae poisoning.

The dog
became ill after being taken for a walk along the Tukituki
River bank and by a small stock watering pond, it was
subsequently euthanised.

The dog’s symptoms and history
of contact with water suggested that cyanobacteria poisoning
was likely. However an initial survey of the Tukituki River
in the vicinity found low to no risk of cynaobacteria and
test results from the pond have come back negative for algae
toxins.

Hawke’s Bay Regional Council Group Manager –
Resource Management Iain Maxwell says while the results were
negative in this case algal mats have been found recently in
other parts of the river and the incident provides a timely
reminder for dog owners to be vigilant with their canines
and not allow them to eat any unknown material around the
river to avoid poisoning.

He says the growth of
potentially toxic blue-green algal mats is common in rivers
during periods of low river flow and warm temperatures.

Hawke’s Bay District Health Board
Medical Officer of Health Nicholas Jones says any contact
with the toxic form of the mat may cause vomiting,
diarrhoea, numbness or tingling around the mouth,and skin
rashes in humans. He says dogs are particularly susceptible
to the toxins which may cause paralysis.

“Rivers users
should avoid any contact with algal mats, avoid swimming in
water where the mats are present, and keep dogs from
scavenging around the river,” says Dr Jones.

The
cyanobacteria mats are identifiable by a strong musty odour
and can vary in colour from brown/black when in the water to
a pale brown/whitish colour when dry.

Dr Jones says if
anyone displays signs of illness after being in a river bed
they should seek medical advice from a doctor immediately.
Similarly, any dogs or other animals that get sick after
being in a river should get prompt veterinary attention.

Cyanobacteria is a naturally occurring algae species
found in water bodies throughout the country. As part of
HBRC’s routine water quality monitoring staff run cross
sections to check for the presence of this algae.

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